2nd Chance PI

[dantech]

in my archive v32 (attached above) there are fusebits setting for 328P

[Wiltran]

1. I am using Atmel Studio 4.1 for programming 328p, The settings shown for Ponyprog are for 328, not 328P. Does anyone know the fuse settings for Atmel Studio4? the settings shown for Ponyprog are different than Atmel studio4.1 2. the layfile shows a capacitor X next to MCP3201. Should this part be ommitted?

[dantech]

v032 is released.
Lighter anti commercial lock - a message lasts 10s only

[dantech]

v028 is released

https://chomikuj.pl/dantech/2nd+ChancePI/Firmware

[waltr]

Borrow the O'scope and check oscillator and then the Pulse output from the Atmega.
O'scope is a must.

[fekemil]

My bad. I had to add two 22pF capacitor and a 16MHz crystal, now I can easily program the Atmega328P.

The circuit still not working. There is 11.7V on the search coil pins. Static sound from the spaker, static picture on the LCD

Any idea? Where can I start the debugging? I can borrow an oscilloscope.

[fekemil]

I tried to program the Atmega328P but no success. I have used Extremeburner with USBasp. I could write the hex, but after I tried to write the fuse bits there was an error message. After that the program could not communicate with the mc. Every fuse bits was exatly as it should be, I double checked everything. Now I have 2 died mc's. I did a test to see if it works, but only one line black square is on the LCD.
I still have a problem with the enormous power consumption of the search coil when I plug it into the circuit. I'm stuck.
I think it's time to let go this project

[fekemil]

Thanks for the idea, I'm not there yet. But after I soldered the buttons, there is -11,3V on pin5 LT1054. That was the problem

[waltr]

My fault, there is negative voltage on the LT1054, but only -8V, and is constantly decreasing. LT1054, NE5534 and R13 are warm.

Is the TX PULSING with correct Width and frequency??
Check with your O'scope.

[fekemil]

My fault, there is negative voltage on the LT1054, but only -8V, and is constantly decreasing. LT1054, NE5534 and R13 are warm.

[fekemil]

Thank you, I skip the bootloader.
I put the circuit under power, its power consumption is around 70 mA. But with search coil attached, its going up to 1 amp. There is no negative voltage on the pin 5 of LT1054. Strange...
If I changed the resistance of the R26 potmeter, the voltages are also changed on the pins of the Atmega IC socket. Is it for this purpose? Keep the voltage on the IC below 5.5V?

[phred01]

[QUOTE=fekemil;245450 I ordered an USBasp programmer, which I think good to program this IC. I have a blank IC, do I need program bootloader in it? I think the answer is no, because this is not Arduino.
Thanks[/QUOTE]
yes it is not ardunio and a boot loader is not required however u need to program the blank chip with andys s/w

[fekemil]

I'm nearly finished my circuit. Not too elegant, some ugly soldering, but looks short circuit free. And I have some questions
What is the purpose of R26? (Volt meter adjust) What value should be seen on the voltmeter while turning the knob? And where can I measure?
The other thing is the Atmega328P. I ordered an USBasp programmer, which I think good to program this IC. I have a blank IC, do I need program bootloader in it? I think the answer is no, because this is not Arduino. The buttons and the programmer will arrive shortly. I have to learn to program this chip so far.
Thanks

[dantech]

Hi,
Firmware v27 is released:

https://chomikuj.pl/dantech/2nd+ChancePI/Firmware

[phred01]

from russian web page translated
pawol
Post subject: Re: 2nd ChancePI
Сообщение Posted: Fri: Oct 28, 2016 8:48 pm
Не в сети

Registered: Wed: Jan 30, 2008 5:59 pm
Messages: 100
Location: Poland
v012 is available

Because of question from users I have to clarify a little bit ...
Entire Q6 solution was a bit "fictious" in the original Chance PI. It did not work properly in fact
did nothing usefull instead of additional and unwanted 100mA power drain
So I do not drive Q6 in the 2nd Chance and I have changed the way of coil driving.
For instance the original Q6 solution drains 180mA but my solution drains 80mA.
Is there any difference?
Like I said Q6 solution was not succesfull
Should not be difference if Q6 circuit is placed or removed from PCB when using my software.
In my software Q6 is driven as inactive whole time. The ICL7660 / LT1054
is enabled whole time also.

So, simplifying, my release should be backward compatible. I do not test it at all.
For purity reasons I have removed Q6 circuit from my pcb completly and new schematic diagram and pcb.

By the way, a few things good to know about 2nd Chance PI:
- OK button pressed whilst starting restores default settings
- Menu button pressed whilst starting direcly into menu without battery test.
It can be usefull when you set battery U min level higher than voltage battery you have.
Normally you will see "low battery". So use this method.
- Default settings are proper in my case. Everyone should test the device and enter own settings

Posted on: January 09, 2018, 12:31:10 pm

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2nd chance video
youtube.com/watch?v=AdzgmCRVShM